package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品（口味）
     * @param dishDTO
     */
    @Transactional  // 因为涉及到两张表的操作
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);

        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        // 获取其insert语句生成的主键值
        Long dishId = dish.getId();


        // 向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);

        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能够删除——是否存在起售中的菜品
        ids.forEach(id -> {
           Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        // 判断当前菜品是否能够删除——是否被套餐关联了？
        List<Long> setmealIds = setmealDishMapper.getsetmealIdsByDishIds(ids);
        if (setmealIds !=null && setmealIds.size() > 0) {

            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            // 删除菜品口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        // 对上面的代码进行优化，无论菜品数量有多少个，都只发2条sql
        // sql: delete from where id in (?, ?, ?)
        dishMapper.deleteByIds(ids);

        // 根据菜品id集合批量删除关联的口味数据
        // sql: delete from dish_flavor where dish_id in (?, ?, ?);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        // 将查询到数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        // 修改菜品表基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);

        }
    }
}
